Radio loud speaker



Aug. 16,1927.

' wie LOUD semmai L um am 1a 152 Patented 16,v 1927.

UNITED STATES insane PATENT orricr..

HENRY GREEN, or UNION HILL, NEW JERSEY, Assrenoa 'ro nnnmannrreonns, or NEW Yonx, N. Y.

mimo LOUD ernennen." t

Application l'ed June 18, 1926. Serial No. 116,957.

The objet of this invention is to provide a radio loud speaker employing a novel form or' connection` intermediate the induction spool, magnet poles and diaphragm in order to obtain greater efficiency in the vibration of the diaphragm, with increased volume and avoidance of sound distortion.

The invention will be understood by reference to the accompanying drawings, in

= which- Y Figure lr is a fragmentary sectional plan View of the loud speaking unit showing an embodiment of the invention applied thereto, the same being on the line l1, Figure 2;

Figure 2 is a side elevation of the same, the diaphragm supporting members being shown in section, and

Figure 3 is a front elevation of the device illustrated in Figure l;

Figure 4 is a bottom plan view of the vibratory connection intermediate the diaphragm and the magnet poles, and

Figures 5, 7 and 9 are similar views of di'erent modilications;

Figure 6 isy an elevation of the device shown in Figure;

Figure 8 is an elevation of the device shown in Figure 7; y

Figure 10 is a side elevation of the device shown in Figure 9, and

Figure 1i. is a front elevation of the same.

In 'Figures 6H 8 and 10 the connection device is shown attached to a diaphragm.

Referring to the. drawings, 1 indicates a supporting plate forming 'part of a loud speaker unit which includes the connected rings 2 and 3 which clamp between them a. diaphragm 4. Mounted upon plate l is a magnet (not shown) and an induction spool 5, the windings extendingy about a central supporting member 5)c which is provided with a. central slot or space v6 (Figure 3) for the reception of the vibratory tongue or plate '7. At the top of this plate is the operative end of angular magnet pole piece 8, a co-operating magnet-'pole piece 9 being disposed below the vibratory plate.

In `)Former constructions the vihratory plate has been connected .to the centre of the diaphragm by a needle.l and the plate has been supported Within the spool by upper and lower pins which permit the plate to have a rocking motion on substantiallya lcentrally disposed axis. One defect in such 55 construction is that a lateral force is exerted upon the needle in addition to the endwise force, Which causes the diaphragm to abnormally resist the normal motion of the needle and the resultant lateral stress upon the diaphragm causes asound distortional effect.-

A. further objection to such needle connection is that the latter bears upon a very 4small area only at the axis of the diaphragm, and frequently a greater range of movement is permitted in the needle and .in th dia-V phragm than is required for a correct fibration. There is too much spring in the needle and in the resultant diaphragm movement. I have discovered that when 'the diaphragm is given short and rigidly applied movements as contrasting with the springry action ot a. needle, and the force exerted upon the diaphragm is applied over a substantial area (which not be confined' to the axis of the diaphragm) very much better results are obtained.

My connection intermediate the diaphragm and the vibratory plate consists of a. short, stiff, rela-tively wide member l() which may be described as a plate, although it is not necessarily flat. At its contact end with the diaphragm it 'is provided with a tongue, and in the drawings l have illustrated four diiferent forms of this tongue. In the form illustrated in Figures 2, `s and 4;', the tongue comprises two curved members l1, 11*,the plate and the tongue on line meeting the diaphragm forming a substantially cylindrical member as viewed inFigure 4. In Figures 5 and d the tongue 12 is formed in reverse curves of Widearea. In Figures Y and 8 the tongue 13 is similar in form to that of Figures 5 and 6, but all substantially less spread. ln Figure 9 the tongue comprises two straight members 14.

In Figures 4, 5 and 9, each vibratory plate 7 is provided with a short front extension 7* for securing to arigrid member, such as a member of the induction spool. In Figurel 7 the vibratory plate 7 is 'provided with the pintles 15, for pivoting; the plate in the induction spool, and the plate is formed with the front extensions 1 6 to be supported on plate l, by means of the posts 17. it `will be seen that the tongue l-f is placed intermediate posts l? and pintles l5. The vibratory plate therefor acts as a 'primary 'diaph ragni and the diaphragmd as ay secondary diaphragm. This construction is similar to that w ej) rima 3 in Figur?, 5 .in that the vibrator); plate shown `ini sziidgiii'e is provided with nii extension and anionnting may he empioyed onomitted- :is desired.

Having do" viiiiin :ind desiiie to is :is foiiowszi. in ii indio loiid sprnhei, iin induction spooh a magnet, :i vihmtoiy pinto supported foi' vihizition h); said nnigg'neh :i diiiphi'ngni7 :i tongue extendingr tiniisvei'seiyof the diii phiagni :ind connected therewithl sind n iigid eonnei'onbetween said tongue und the Yihizitoi-y plate. I

2. n :i radio, iond spenh'ei, an induction Hpooi, n inn'gnetG magnet noir-n.021 vihizitoiy pinto adapted to he acted niion hy, smid poles, ii diaphragm, and. a plate-idle ineinhei' con- :i-ihed my invention 'what seenie hy Letters Patent 'veiseiy oi' the diaphragm and member directly 1 the dinphrzigm and the vibegtoiy i'ilii'zign'i, n Connection intei'iiiedinte said dii1- phi-ngii'i and the magnet 'comprising :i viin'etoiy plait/e, a tongue extending trans- Connected thereto :ind ii pintedike eonneeting;A the tongue andthe plete.

4. i device eonsti'iieted in accordance wiih claim 1 in which the vihrzitoiy piate is supported at spaced `points :it opposite sidea of the connection with the tongue, so that lthe plate acts as a primary diaphragm.

Vi. n sound amplifying appariitno, a connectionintermediate a 'magnet eind e dinE phi'ngin `consisting: of a vihratory plate" having a phite extension at right angles thereto constituting :iv stiff, plate-like inemi'ieitoi' direct connection to the diaphragm.

. In tesit'iinony whereof, I have signed my' naine to this specification.

HENRY GREEN. 

